采用单一重组分代替复杂馏分模拟酮苯脱蜡溶剂回收过程

Simulation of process for butanone-toluene solvent recovering in dewaxing of complex oil and/or wax mixtures replaced by a pseudo-single heavy component

运用流程模拟软件对酮苯脱蜡溶剂回收系统(多效蒸发)进行了模拟。计算结果表明,采用一种重组分代替复杂润滑油及蜡馏分可以得到与工业生产实际相符的模拟结果,其计算结果可与TBP(实沸点蒸馏曲线)虚拟组分法所得结果相媲美。究其原因是该系统中溶剂(丁酮及甲苯)与润滑油及蜡各种性能差异很大,与上述差异相比,润滑油及蜡不同组分间的相对差异就显得不太重要了。这样,采用一种重组分代替复杂馏分模拟酮苯脱蜡溶剂回收过程,就可以得到令人满意的计算结果。本文方法使计算过程大为简化,有利于采用解析方法对过程进行分析研究;所得结果已经成功应用于酮苯脱蜡溶剂回收系统分析与节能改造。

The recovering system（multi-effect evaporation）of butanone-toluene solvent of dewaxing process is simulated with a process simulator.It is shown that good results can be obtained when the complex oil and/or wax mixtures is replaced with a pseudo-single heavy hydrocarbon component in the simulation.The results obtained in this work are comparable to that obtained by the TBP（true boiling point curve）method.One of the possible reasons might be that there is very large difference between molecule properties of the solvent and original oil and/or wax.Compared to the large difference,the difference of molecule properties becomes less important in the oil and/or wax mixture.Therefore,it is possible in the simulation to use a pseudo-single heavy hydrocarbon component instead of complex oil and/or wax mixtures and satisfactory results can be obtained,which can make simulation calculation simple and is favorable for analysis and study of the solvent recovering system.These simulation results have been successfully used in the retrofit of the solvent recovering units in butanone-toluene dewaxing process at a Chinese company for energy saving.